diff --git a/master_changes.md b/master_changes.md
index fae278b6a1b..2b19909235e 100644
--- a/master_changes.md
+++ b/master_changes.md
@@ -101,6 +101,7 @@ users)
   * Add menhir to the list of vendored packages [#6321 @kit-ty-kate]
   * Upgrade the vendored spdx\_licenses to 1.3.0 [#6370 @kit-ty-kate - fix #6369]
   * Bump the vendored dune to 3.16.1 [#6192 @kit-ty-kate]
+  * Fix compilation on macOS with OCaml 5.3 by bumping the vendored mccs to 1.1+19 [#6192 @kit-ty-kate]
 
 ## Infrastructure
 
diff --git a/src_ext/Makefile.sources b/src_ext/Makefile.sources
index 4a82329168c..01edf1a2989 100644
--- a/src_ext/Makefile.sources
+++ b/src_ext/Makefile.sources
@@ -22,8 +22,8 @@ MD5_cudf = ed8fea314d0c6dc0d8811ccf860c53dd
 URL_dose3 = https://gitlab.com/irill/dose3/-/archive/7.0.0/dose3-7.0.0.tar.gz
 MD5_dose3 = bc99cbcea8fca29dca3ebbee54be45e1
 
-URL_mccs = https://github.com/ocaml-opam/ocaml-mccs/releases/download/1.1+18/mccs-1.1+18.tar.gz
-MD5_mccs = 3fd6f609a02f3357f57570750fcacde0
+URL_mccs = https://github.com/ocaml-opam/ocaml-mccs/releases/download/1.1+19/mccs-1.1+19.tar.gz
+MD5_mccs = f852da188bf7de20e64be2fce0e48e0a
 
 URL_opam-0install-cudf = https://github.com/ocaml-opam/opam-0install-cudf/releases/download/v0.5.0/opam-0install-cudf-0.5.0.tar.gz
 MD5_opam-0install-cudf = 75419722aa839f518a25cae1b3c6efd4